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It uses the fact, that every thread in Qt ( QThread) has a Event-queue by default. So if you call the Signal of the QObject the method generated by Qt will enqueue the command to call the Slot in the Event-queue of the other QObjects thread. The Signal-method returns immediately after enqueuing the command. QThread with signals and slots | Qt Forum That processImage method gets called from the right thread (in the example, the GUI thread, which is where the RenderThread object is living), so it's safe to use that way. Messaging and Signaling in C++ - meetingcpp.com Signals and Events in Qt. But lets start with Qt. Qt offers two different systems for our needs, Qt signal/slot and QEvents. While Qt signal/slot is the moc driven signaling system of Qt (which you can connect to via QObject::connect), there is a second Event interface informing you about certain system-like events, such as QMouseEvent, QKeyEvent or QFocusEvent. How Qt Signals and Slots Work - Part 3 - Queued and Inter ... Like with a QueuedConnection, an event is posted to the other thread's event loop. The event also contains a pointer to a QSemaphore. The thread that delivers the event will release the semaphore right after the slot has been called. Meanwhile, the thread that called the signal will acquire the semaphore in order to wait until the event is ...
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[QTBUG-70412] Qt::DirectConnection to a thread-safe ... It is unclear from a documentation if direct connection to thread-safe functions between threads is supported by signal and slot connections. No warnings are printed ... Qt Slot Thread Safe - TURBO SERVIS NIS
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Thread-Safety. Clearly, the access must be serialized: Thread A must perform steps 1, 2, 3 without interruption (atomically) before thread B can perform the same steps; or vice versa. An easy way to make the class thread-safe is to protect all access to the data members with a QMutex:
Messaging and Signaling in C++ - meetingcpp.com Messaging and Signaling in C++. ... Qt signal/slot implementation is thread safe, so that you can use it to send messages between different QThreads, this is especially important, as anything UI related should run in the main thread of Qt, anything that could block your UI should not run in this thread, so running jobs in a QThreadPool and ... Signals and slots - Wikipedia
Thread Support in Qt - Qt Documentation Thread Support in Qt. A detailed discussion of thread handling in Qt. Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Thread Support in Qt | Qt 4.8 Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Reentrancy and Thread-Safety | Qt 5.12